(NEW YORK) — Summer officially kicks off on Wednesday and many across the U.S. will certainly be feeling the heat.
In the Midwest, Chicagoans are in store for the hottest start to the season in over three decades. Temperatures in the Illinois city are expected to hit the 90s on Wednesday for the 13th day this year, tying a record set back in 1977.
But the real heat will be concentrated over the Northeast, where 13 states are under heat warnings and advisories. Temperatures there are expected to hit the mid- to high-90s on Wednesday, marking more than a 20-degree jump in less than 24 hours.
The weather will be even hotter on Thursday across the Northeast, with actual air temperatures of 100 possible from Washington, D.C., to Boston. If that happens, many major cities could break records.
The heat wave will continue in the region through Friday, when temperatures are also expected to hit the 90s, before cooling off over the weekend.
Copyright 2012 ABC News Radio
Ray Sanchez, CNN Newswire
Eric Bradner, Dana Bash and MJ Lee, CNN